libstdc++-6.dll issues

Question

I would like to bring forward an issue regarding MinGW 4.7.2 I first ran into the deadly issue caused by libstdc++-6.dll when I ventured in OpenCV. Luckily, I ran across a workaround here -> http://answers.opencv.org/question/3740/opencv-243-mingw-cannot-run-program/. It looked great, for a time.

Now I am trying to implement complex numbers. I try the following code

#include <iostream>
#include <complex.h>
using namespace std;

int main(int argc, char* argv[])
{
    float _Complex d = 2.0f + 2.0f*I;
    cout << "Testing Complex\t" << d;
    return 0;
}

It should run, by all means. I face no errors or warnings while linking. I use CodeBlocks as my preferred IDE in Windows. But, again, I am stymied. Here is the AppCrash report

Problem signature:
  Problem Event Name:   APPCRASH
  Application Name: complex.exe
  Application Version:  0.0.0.0
  Application Timestamp:    515d61f7
  Fault Module Name:    libstdc++-6.dll
  Fault Module Version: 0.0.0.0
  Fault Module Timestamp:   4ed82a4d
  Exception Code:   c0000005
  Exception Offset: 000462bc
  OS Version:   6.1.7600.2.0.0.256.1
  Locale ID:    1033
  Additional Information 1: 0a9e
  Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
  Additional Information 3: 0a9e
  Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Yet amazingly, How to work with complex numbers in C? provides a perfectly working C code!

#include <stdio.h>      /* Standard Library of Input and Output */
#include <complex.h>    /* Standart Library of Complex Numbers */

int main()
{
    double complex z1 = 1.0 + 3.0 * I;
    double complex z2 = 1.0 - 4.0 * I;

    printf("Working with complex numbers:\n");
    printf("Starting values: Z1 = %.2f  + %.2fi\tZ2 = %.2f  + %.2fi\n",creal(z1),cimag(z1),creal(z2),cimag(z2));
    double complex sum = z1 + z2;
    printf("The sum: Z1 + Z2 = %.2f %+.2fi\n", creal(sum), cimag(sum));
    return 0;
}

As you can see, again the faulty libstdc++-6.dll comes into play. Can anyone suggest me any workaround this time, hopefully without downgrading to previous versions of MinGW, as I would then have to rebuild all my libraries.

Any help will be appreciated!

Wellcome to SO. This is probably not the right site for your issue. With something like that you should file a bug report to your platform provider. And, BTW, C99 and C++ are generally not compatible, in particular complex numbers seem to be managed differently between the two. — Jens Gustedt, Apr 04 '13 at 11:55
@JensGustedt: this underlying problem is not platform dependent, and this question is good for SO. — rubenvb, Apr 04 '13 at 12:52
@rubenvb So a `relevant` recommendation would be to write up a bug report for MinGW? But even that would require some information -- like the compiler (and version). — devnull, Apr 04 '13 at 13:01
@rubenvb: Thanks. I knew this was not a problem for just windows because it gave me a segmentation fault! — Binayaka Chakraborty, Apr 04 '13 at 14:28
@devnull: I personally don't prefer Cygwin. I like to build my own binaries from the sources, and thus am partial to GNUWin32 :) I also posted this question because I found many unanswered questions that have their problem root in that particular dll. — Binayaka Chakraborty, Apr 04 '13 at 14:32
@JensGustedt: Glad to be here :D Thanks for the warm welcome. I know the issue regarding complex numbers in C99 and C++, but I didn't believe that would translate to such a large difference in their type of execution. — Binayaka Chakraborty, Apr 04 '13 at 14:35

score 1 · Accepted Answer · answered Apr 04 '13 at 12:04

Like Jens said I don't think the complex.h header file is compatible with C++. In C++ you should be using the complex header like so:

#include <iostream>
#include <complex>

int main()
{
  std::complex<double> c1(1.0,1.0), c2 ;

  c2 = pow(c1,2.0);

  std::cout << c1 << "  " << c2 << std::endl; 
}

libstdc++-6.dll issues

1 Answers1